Opalite (Synthetic Opalized Glass)
Synthetic Silicon Dioxide (SiO2) glass
Category
Browse mineralish (variety of chalcedony) specimens identified by the Rock Identifier community.
Opalite (Synthetic Opalized Glass)
Synthetic Silicon Dioxide (SiO2) glass
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Rose Quartz
Rose Quartz (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Quartz (likely a clear or rock crystal variety)
Quartz (SiO2 - Silicon Dioxide)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Onyx Marble (also commonly called Onyx)
Calcite (CaCO3), often with other mineral impurities
Blue Calcite
Calcium Carbonate (CaCO3)
Granite
Phaneritic high-silica plutonic rock (composed primarily of Quartz, Feldspar, and Mica)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Ametrine
Ametrine (SiO2 - Silicon Dioxide with trace amounts of Iron)
Chert (Nodular Chert)
Microcrystalline Silica (SiO2)
Chert (and Flint)
Silicon Dioxide (SiO2)
Sapphire (Corundum variety)
Sapphire (Al₂O₃)
Black Tourmaline (Schorl)
NaFe3Al6(BO3)3Si6O18(OH)4
Quartz
Quartz (Silicon Dioxide - SiO2)
Chert (specifically Tan/Brown Chert)
Chert (SiO2)
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
Pyrite
Iron Sulfide (FeS2)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Gray Quartz (Tumbled)
Silicon Dioxide (SiO2)
Quartz (Quartzite fragment)
Silicon Dioxide (SiO2)
Quartz
Silicon dioxide (SiO2)
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Chert (Chert Nodule with Cortex)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
Desert Rose
Gypsum (variety Selenite) - CaSO4·2H2O
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide) with trace iron impurities
Satin Spar Gypsum
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Milky Quartz with Mineral Inclusions
Quartz (Silicon Dioxide, SiO2)
Opalite
Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)
Quartz (River-worn Pebble)
Quartz (SiO2)
Aquamarine
Beryl (Be3Al2Si6O18)
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
Apatite
Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))
Nephrite Jade
Nephrite
Chert (varietal known as Jasper or Flint)
Silicon Dioxide (SiO2)
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Quartz
Quartz (SiO₂)